Electric switch and terminal



Aug. 25, 1931. J. D. wQoD 1,820,875

Fild Feb. 18. 1927 4,5 jive/627222705 Patented Aug. 25, 1931 Avnerrle*1v srarss Per J'SEPH D. VWOQDQ 0F,W0LLASTON, MASSACHUSETTS, ASSIGNC- TCCNDIT EIECTRAL MANUFACTURING COMYNY, OE SGUTH BGSTON, MA

0F MASSACHUSETTS ELECTRIC )SWTCH AND -TEREVIIAL Application led February18, 192?. Serial No. lfl.

This invention relates to electric switches Y and hasfor `an object theprovision of an 'raf improved form o-f'stationary switch membercharacterized by having a conducting stud 1 and a contact memberintegral therewith.

A iurther object is the provision of inexpensive and reliable means forsecuring they conducting stud within' its insulating bushing. n s

A further object is generally to improve the construction of elect 1icswitches.

Figs. l and 2 are front and side elevations respectively vof astationary switch member or terminal for anelectric switch and embodyingthe invention. n y n Fig. is a sectional elevation through the switchm-ember.

Fig. Ll is a plan view of the switch member dit Fig. l.

yposed inwardly directed arms 24 closelyv Aoverlyingl opposite sides ofthe bushing. Clamping bolts 26 are passed through said y Fig. 5 is aperspective detail illustrating the manner of attaching the auxiliarycontact member to the-stationary switch member. f f

F ig. 6 is an elevationlin detail, illustrating a modifiedarrangementfor securing the conducting stud toits insulating bushing.

lFig. 7 is a plan view-of` Fig. 6.

. y The stationary switch member or terminal embodying this invention.includes a generally Vrectangular insulating bushing l0 of substantiallength having flat upper and lower faces l2 and l-l respectively and agenerally rectangular outstanding integral attaching flange 16intermediate its ends.` rEhe bushing is extended through'a'rectangularopening 18 in a supporting plate 20,.with the liange seated upon theplate. The 'dimensions of' the opening closely approximate thecrosssectionaldimension of the bushingunder the ilange, whereby thebushingis supported against angular displacement in said plate. Thebushing is secured detachably in the aforesaid relation by a pairofrigid clamping plates 22-which are disposed on opposite sides of thebushing upon the'tlange and have opplates and the supporting plate 2Owhereby to bind the bushing-,fiange ybetween them.

he bushing is provided wih a substantially rectangular passage 2&5thcrethrougl which is extended along its longitialinal axis and acoiulucting-stud 3() havingl a correspending rectangular cross-sectionis received detachably in said passage and is ezitended below the low-erend ot the bushing and also thercaboife to provide a line-connectingsection The lower end ot' said stud is reHeXed at substantially rightangles with the body portion thereof to provide :in integralmaiii-contact-member` 3st ha ving a flat lower contact tace adapted tobe engaged by the main current-carrying or bridging screw f2 and havinga Contact Vsection wh ich is opposed tothe main contact member 36 and isin approximately the same horizontal plane therewith and is adapted tobe engaged by the cooperi-iting movable arcing member 4G. The staoionarvarr-ing member is `additionally secured to the stud againsty angulardisplacement thereon by a strapmemb-er 4S which is interposed betweensaid screw and the shank oit the contact member. Said strap and memberis ot general channel-shape and has side-walls 50 which closely engagethe oppor side tacos of the shank. intermediate ootssaiding sections 50awhich overlie the broad 'tace of the stud on opposite sides of theshank. and relexed opposed ende which closely lit the opposA or edges oithe stud., thereby incventing rotation ot the rContact member.

The conduct stud is; secured detachahly within the insulating bushing'by incl'uding` a plate 52 disposed upon the lad and bearing against thelower fare of' the idea bushing. A pin 54 is received loosely in anaperture in said stud and is extended in both directions beyond the studand bears against the plate. Said plate has a depending peripheralflange 56 which overlies the opposite ends of the pin and preventsdisplacement thereof. The upper end of the stud is formed withpreferably a square opening 58 therethrough in which a pressure-bar 60is -loosely received. .Clamping screws 62 are screwed in the ends ofsaid bar, on opposite sides of said stud and bear against a pressureplate G3 seated on the upper end of the bushing, whereby vto cooperate'with the .pin 54 in clamping the stud to the bushing.y The stud can bew tlidrawn from the bushing upon the removal of the screws G2 and thebar d0. ln the modification illustrated-in Fig. 6, a U- shaped .lockinglever Sil is detachably pivotnlly connected with the stud'by a bolt 66land has cam-prejeetions yG8 located on opposite sides :of the studwhich bear upon a plate seatedupo-.n the upper end o f the bushing for.the une purpose.

The auxiliary Contact member and terminal herein claimed arev describedin my copendino :application Serial No. 169,3il, filed Febri y 18, i927.

l claim:

"1. Afterminal for :an electrical apparatus comprising an insulatingbushing, a conductor disposed therein, and clamping means for saidconductor comprising pin extended loosely through` said conductor andbearing against the lower face of said bushing, a pres#Asure-har'extended loosely through said conducter :at the upper endthereof, :and clamping-screws carried detaehably .by said bar onopposite. above and bearing against the uppers-nd of said bushing; l

2. A terminalfor an electrical apparatus comprising an insulatingbushing, a conductor disposed therein, and clamping means for saidconductor comprising apin extended loosely through said conductor andbearing Y against the lower face of said bushing, `mea-ns to secure saidpin against axial displacement includ-ing a plate on the lower end oflsaid bushing and surrounding saidconductor and having opposeddependingl flanges extended Vover the ends of said-pin, a pressure-bareX- tended loosely through said conductor at theupper end thereof, vandclamping-screws carried detachably by said barren opposite sides yofsaid conductor disposedabove and'bearing against the upper end offsaidbushing.

3. An velectric switch *havingV a'V terminal .including a rectangularconductor, a contact member carried by said vconductor having Aa shankabutting against a broad face-.of said conductor within the edgesthereof, and .clamping means for said'c'ontact member including a scr-ewpassed through said shank 5565* and connected withsaid cenductor, andVLa nesef said conductor vdisposed strap interposed between said screwand shank and having opposed walls closely f1tting over the oppositesides of said shank and intermediate sections lying upon the broad faceof said conductor andk reliexed opposed ends atthe ends of saidintermediate lsections closely fitting over theside faces of saidconductor.

d. A stationary switch member including a rigid vertical porcelainbushing of rectangular section having,.arectangularaxial passagetherethrough, a rigid conductor of corresponding rectangular sectionextended removably through said passage and beyond both the upper andlower ends of said bushing, Vthe upper end .of-said conductorconstituting connecting meansfor a circuit lead,

Iand the lower endrof said conductor having an an@nlarly-disposed fre-eend which constitutes a contact member, and' means securing saidconductor removably in the aforesaid relation -including a pin which "ispassed through and is extended beyond the opposite sides of saidconductor under said bushing, a

.bearing plate having a rec angular conductor-opening engaged with.thebottom end of said .bushing .over said conductor and having opposeddepending projectionswhich overlie the opposite ends of said pin andrestrain it in the aforesaid relation, a second bearing plate having arectangular conductor-opening engaged with the upper end of saidbushingover said conductona transverse member extended removably througha passage inzsaid conductor above said second bearing plate and inopposite directions beyond said con-` ductor having removable meanswhich bear Ydevices which .are disposed above the,..bus'h ing .onopposite sides ofthe conductor Vand haveV their lowerendsfbearlng uponthe top of said bushing,- whereby to drawthe conductor .upwardly tomaintain said pin in 'pressure engagement `with the'bottom of thebushing, and a connecting member which Vsupports said clamping devicesand which is passed removably through thetop of -and is carried bysaidconductor.

ln testimony whereof, I have signed my name to this specication.

,rosari-LD; woon.

